Which of the following cell components is not directly involved in synthesis or secretion?
a. ribosome
b. rough endoplasmic reticulum
c. Golgi body
d. smooth endoplasmic reticulum
e. lysosome
e. lysosome
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The conducting cells in xylem are
A. sieve tube elements. B. tracheids and sieve tube elements. C. tracheids. D. tracheids and vessel elements. E. vessel elements.
Impaired vision after a blow to the head implies damage to the vision processing center in the brain. Which region of the brain controls vision?
A. frontal lobe B. parietal lobe C. temporal lobe D. occipital lobe E. brainstem
When a farmer grows cotton containing the gene for Bt toxin, insects that are resistant (rr) survive and reproduce. This is an example of Select one:
a. natural selection. b. dominance. c. independent assortment. d. recombination. e. genetic drift.
Which observations of species distribution across Earth support the theory of common descent?
A) All continents contain nearly identical organisms. B) Each part of Earth contains life forms perfectly designed for that region. C) One can see similarities in organisms that are found in close proximity, but each population has adaptations that suit the organisms to their particular habitat. D) There are very few similarities among life forms on different tropical islands.